// MonoHotDraw. Diagramming Framework
//
// Authors:
//	Manuel Cerón <ceronman@gmail.com>
//
// Copyright (C) 2006, 2007, 2008, 2009 MonoUML Team (http://www.monouml.org)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using Cairo;
using MonoHotDraw.Util;

namespace MonoHotDraw.Figures
{	
	public abstract class StackFigure : CompositeFigure
	{
		protected StackFigure () : base ()
		{
			Position = new PointD (0.0, 0.0);
			spacing = 2.0;
		}
		
		protected abstract double CalculateHeight ();
		protected abstract double CalculateWidth ();
		protected abstract void UpdateFiguresPosition ();
		
		public double Spacing {
			get { return spacing; }
			set { 
				spacing = value;
				CalculateDimensions ();
			}
		}

		protected override RectangleD BasicDisplayBox {
			get {
				return new RectangleD {
					X = Position.X,
					Y = Position.Y,
					Width = this.Width,
					Height = this.Height,
				};
			} set {
				Position = value.TopLeft;
				UpdateFiguresPosition ();
			}
		}

		protected double Height { get; set; }
		protected PointD Position { get; set; }
		protected double Width { get; set; } 

		protected sealed override void OnChildAdded (FigureEventArgs e)
		{
			e.Figure.FigureChanged += OnChildChanged;
			CalculateDimensions ();
			base.OnChildAdded (e);
		}
	
		protected sealed override void OnChildRemoved (FigureEventArgs e)
		{
			e.Figure.FigureChanged -= OnChildChanged;
			CalculateDimensions ();
			base.OnChildRemoved (e);
		}

		protected void OnChildChanged (object sender, FigureEventArgs args)
		{
			CalculateDimensions ();
		}
		
		private void CalculateDimensions ()
		{
			WillChange ();
			Width = CalculateWidth ();
			Height = CalculateHeight ();
			UpdateFiguresPosition ();
			Changed ();
		}
		
		private double spacing;
	}
}
